JP2013173192A5 - - Google Patents

Description

According to one aspect of the present invention, web cutting method includes the steps of conveying tension to the web, the conveyed roux Ebb, and cutting in the width direction while moving the upper and lower blades, the In the process of cutting the web, the web upstream side and the web downstream side of the cutting point between the upper blade and the lower blade are sandwiched from the thickness direction of the web, and the web is upstream of the moving direction of the cutting point on the web. The downstream side is clamped from the vertical direction of the web, and the cutting point, the two clamping points on the web upstream side and the web downstream side of the cutting point, and the clamping point upstream in the movement direction on the web of the cutting point are substantially Position on the same plane.

Preferably, a force is applied in the upstream direction of the web at the clamping point upstream of the cutting point in the moving direction.

According to another aspect of the present invention, a web cutting device is a web cutting device that cuts a conveyed web in the width direction, and includes a pair of rotary cutters composed of an upper blade and a lower blade, an upper blade, A pair of left and right nip rollers that are arranged on both sides of the lower blade and the cutting point and sandwich the web upstream side and web downstream side from the thickness direction of the web, and the web downstream side upstream in the movement direction on the web at the cutting point An additional pair of nip rollers, a pair of rotary cutters, a pair of left and right nip rollers, and a traveling device that moves the additional pair of nip rollers in the width direction of the web, and a cutting point, a web upstream side of the cutting point, Two clamping points on the downstream side of the web and a clamping point upstream in the movement direction on the web of the cutting point are positioned on substantially the same plane.

1 to 3 are conceptual diagrams showing the principle according to the present embodiment for suppressing web breakage. As shown in FIG. 1, a pair of nip rollers 44 and 48 are arranged on both sides of a cutting point CP by a rotary cutter composed of an upper blade and a lower blade. The web W is conveyed in the direction of the arrow (from the top to the bottom of the page). At this time, tension is applied to both sides of the web W in the longitudinal direction. The rotary cutter is moved in the width direction substantially orthogonal to the web W conveyance direction. The rotary cutter is disposed obliquely so as to face the upstream side in the web conveyance direction by a predetermined angle (30 ° to 85 °) with respect to the moving direction. By moving the rotary cutter from one end of the web W toward the other end, the rotary cutter cuts the web W obliquely. The cutting point CP moves obliquely on the web W with respect to the web conveyance direction. Here, the cutting point CP means a place where the web is cut by substantially bringing the upper blade and the lower blade into contact with each other in an overlapping state with the web interposed therebetween.

The web downstream side of the cutting point CP is sandwiched in the thickness direction of the web W by a pair of nip rollers 44 (the lower nip roller is not shown). Further, the web upstream side of the cutting point CP is sandwiched in the thickness direction of the web W by a pair of nip rollers 48 (the lower nip roller is not shown). Even if the tension accompanying the conveyance and cutting acts on the web W, the tension is cut off by the two pairs of nip rollers 44 and 48 in the cutting portion CP. The web W is cut along the moving direction (dotted line A) of the cutting point CP. The location where the web W is clamped by the two pairs of nip rollers 44 and 48 is two clamping points. In this case, it is sufficient that there is one clamping point (two clamping points in total) at least on the upstream side and the downstream side of the web W. Further, an additional clamping point may be provided to have a total of 3 or more clamping points.

Further, an additional pair of nip rollers 80 (the lower nip roller is not shown) is disposed on the downstream side of the web, upstream of the movement direction on the web W at the cutting point CP, and sandwiches the web W from the thickness direction. Only the tension in the conveying direction is applied to the cut web W. Since the downstream side of the web W cut by the additional pair of nip rollers 80 is sandwiched, it is possible to counter the tension. Therefore, it is possible to block the application of tension in the direction of breaking the web W at the cutting point CP, and to suppress the occurrence of tearing of the web W due to the opening of the cut end of the web W. One of the cut webs W is wound around an old core that has already been wound for a predetermined length while being sandwiched between a pair of nip rollers 44 and 48 and an additional pair of nip rollers 80.

FIG. 2 shows the relationship between the additional pair of nip rollers 80 and the movement direction A on the web at the cutting point. The pair of additional nip rollers 80 are preferably arranged at a toe-out angle θ of 0 ° or more and 5 ° or less with respect to the moving direction A on the web at the cutting point CP. By arranging the additional pair of nip rollers 80 at the above-described toe-out angle, a force in the direction opposite to the tension acting in the conveying direction of the web W can be applied to the downstream side of the cut web W. The tension acting in the conveying direction is canceled out, and the breakage of the cut web W can be more effectively suppressed.

FIG. 3 shows a state where the other cut web W is cut without being wound around the core. In the present embodiment, a further pair of additional nip rollers 90 (the lower nip roller is not shown) is disposed at a position facing the nip roller 80 across the moving direction A on the web W at the cutting point CP. In other words, a pair of nip rollers 90 upstream of the moving direction of the web W of the cutting point CP, is located on the web upstream side, sandwiching the web W from the thickness direction. A tension on the opposite side to the conveying direction is applied to the other cut web W. Since the pair of nip rollers 90 sandwich the upstream side of the web, it is possible to counter this tension. Thereby, breakage of the web W can be suppressed.

As shown in FIG. 6, a pair of nip rollers 80 and 82 are disposed behind the blade contact extension line of the pair of rotary cutters 16 and 18. A pair of nip rollers 80 and 82 are supported in the upper casing 11 and the lower casings 12 and 14 via the rotation shafts 84 and 86. The pair of nip rollers 80 and 82 are disposed at positions on the downstream side of the web with respect to the direction along the extension line of the blade contact. Since the pair of nip rollers 80 and 82 sandwich the web W from the thickness direction, it is possible to counter the tension in the conveyance direction applied to one of the cut webs W. Further, the pair of nip rollers 80 and 82 are preferably arranged at a toe-out angle of 0 ° to 5 ° with respect to the extension line of the blade contact.

When the cut portion of the web W arrives, a drive motor (not shown) is activated, and the pair of rotary cutters 16 and 18 are caused to travel via the rotational drive of the pulley 32 of the travel device 24. The rotary cutters 16 and 18 start cutting the web W from one side edge as the web is crossed. At this time, both sides of the cutting point CP of the web W are sandwiched by the nip rollers 44, 46, 48, 50 from the thickness direction. In addition, the downstream side of the web is sandwiched from the thickness direction by the nip rollers 80 and 82 upstream of the cutting point CP in the moving direction on the web.

Claims (5)

A process of transporting the web with tension,
Cutting the web to be conveyed in the width direction while moving the upper blade and the lower blade, and
In the step of cutting the web, the web upstream side and the web downstream side of the cutting point by the upper blade and the lower blade are sandwiched from the thickness direction of the web, and the moving direction of the cutting point on the web the web downstream upstream sandwiched in the vertical direction of the web,
A web in which the cutting point, two clamping points upstream and downstream of the web of the cutting point, and a clamping point upstream of the cutting point in the moving direction on the web are located on substantially the same plane. Cutting method. 2. The web cutting method according to claim 1, wherein a force is applied in the upstream direction of the web at a clamping point upstream of the cutting point in the moving direction.   The web cutting method according to claim 1 or 2, wherein the web is made of a cellulose resin. A web cutting device for cutting a web to be conveyed in the width direction,
A pair of rotary cutters composed of an upper blade and a lower blade;
A pair of left and right nip rollers disposed on both sides of the upper blade, the lower blade, and the cutting point, and sandwiching the web upstream side and the web downstream side from the thickness direction of the web;
An additional pair of nip rollers that sandwich the downstream side of the web upstream in the direction of movement of the cutting point on the web;
A traveling device that moves the pair of rotary cutters, the pair of left and right nip rollers, and the pair of additional nip rollers in the width direction of the web;
The cutting point, the two clamping points on the web upstream side and the web downstream side of the cutting point, and the clamping point upstream in the moving direction on the web of the cutting point are positioned substantially on the same plane. Web cutting device.   The web cutting device according to claim 4, wherein the additional nip roller is arranged at a toe-out angle of 0 ° or more and 5 ° or less with respect to a moving direction of the cutting point on the web.